a = 21
b = 10
c = 0
c = a + b
print('(1)c =', c)
c = a - b
print('(2)c =', c)
c = a * b
print('(3)c =', c)
c = a / b
print('(4)c =', c)
c = a % b
print('(5)c =', c)

a = 2
b = 3
c = a ** b
print('(6)c =', c)

a = 10
b = 5
c = a // b
print('(7)c =', c)


